JC
John Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Charleston-County, South Carolina
Our Model Tree links this John Clark across the 1920, 1930 and 1940 US Censuses in Charleston-County, South Carolina (XGBoost, ~Confirmed), with identified parents Julian & Mary — first a son (b.~1911), then head of a 8-person household.
Age 29
b. ~1911
Male
Son
Born: South Carolina
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Charleston-County, South Carolina |
| Surname | Clark |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | South Carolina |
| 1935 Residence (City) | James Island Twp |
| 1935 Residence (County) | Charleston |
| Additional Details | |
| Occupation | Operator |
| Industry | Draw Bridge |
| Class of Worker | GW |
| Hours Worked | 56 |
| Income (1939) | 960 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Occupation | Operator |
| Township / Ward | James Island Twp |
| Est. Birth Year | ~1911 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Lorena Clark | Daughter | — | 17 | ~1923 |
| Margaret Clark | Daughter | — | 19 | ~1921 |
| Julian Clark | Head | — | 58 | ~1882 |
| Julian Clark | Son | — | 15 | ~1925 |
| John Clark | Son | — | 29 | ~1911 |
| Frank Clark | Son | — | ~1940 | |
| Mary Clark | Spouse | — | 57 | ~1883 |
| Mildred Clark | Spouse | — | 30 | ~1910 |
Census Appearances
1920
Charleston, South …
Son, age 8
Charleston, South Carolina · implied b. ~1912 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1930
Charleston, South …
Son, age 19
Charleston, South Carolina · implied b. ~1911 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | Chickenman |
| Industry | Poultry Co |
| Class of Worker | O |
| Can Read/Write | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
Charleston-County, South …
Son, age 29
Charleston-County, South Carolina · implied b. ~1911 — 8 household members
| Surname | Clark |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | South Carolina |
| 1935 Residence (City) | James Island Twp |
| 1935 Residence (County) | Charleston |
| Occupation | Operator |
| Industry | Draw Bridge |
| Class of Worker | GW |
| Hours Worked | 56 |
| Income (1939) | 960 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Julian Clark (~0.92 confidence) and mother Mary Clark (~0.92 confidence) and mother Mildred Clark (~0.60 confidence) and mother Mary Clark (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.84
Father
Julian Clark
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Mary Clark
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Mildred Clark
b. ~1910
Source mother
● Household
· direct · ~0.6
Mother
Mary Clark
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Clark
Son · 1940 · age 29 · b. ~1911 · South Carolina
★ You are viewing this record
Sibling
Lorena Clark
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Clark
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julian Clark
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Clark
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Charleston-County, South Carolina
Open full size
1940 US Federal Census — Charleston-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03795-00399)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James Forest | 45 | Head | Laborer | South Carolina |
| 2 | Melvina Grant | 20 | Niece | — | South Carolina |
| 3 | Beatrice Grant | 2 | Niece | — | South Carolina |
| 4 | Mena Brown | 16 | Daughter | — | South Carolina |
| 5 | Martha M Brown | 15 | Daughter | — | South Carolina |
| 6 | Buster Brown | 40 | Head | Laborer | South Carolina |
| 7 | James Brown | 12 | Son | — | South Carolina |
| 8 | Wilhelmina Brown | 12 | Daughter | — | South Carolina |
| 9 | Marion Brown | 10 | Son | — | South Carolina |
| 10 | Thomas Brown | 7 | Son | — | South Carolina |
| 11 | Lillian Brown | 5 | Daughter | — | South Carolina |
| 12 | Estell Michael | 48 | Head | Laborer | South Carolina |
| 13 | Elias D Rivers | 43 | Head | Farmer | South Carolina |
| 14 | Dorothy R Rivers | 35 | Wife | — | South Carolina |
| 15 | Elias D Jr Rivers | 15 | Son | — | South Carolina |
| 16 | Mary P Rivers | 13 | Daughter | — | South Carolina |
| 17 | Sally Rivers | 8 | Daughter | — | South Carolina |
| 18 | Charles Brown | 41 | Head | Laborer | South Carolina |
| 19 | Elizabeth Brown | 22 | Wife | Worker | South Carolina |
| 20 | Mary Jane Brown | 16 | Daughter | — | South Carolina |
| 21 | Rebecca Grant | 40 | Head | Laborer | South Carolina |
| 22 | Eddie Grant | 18 | Son | Laborer | South Carolina |
| 23 | James Grant | 16 | Son | Laborer | South Carolina |
| 24 | Rosa Grant | 15 | Daughter | — | South Carolina |
| 25 | Anna Mae Grant | 10 | Daughter | — | South Carolina |
| 26 | Mattie Hayward | 50 | Head | Laborer | South Carolina |
| 27 | Ted Reginald | 55 | Head | Laborer | South Carolina |
| 28 | Hattie Reginald | 52 | Wife | — | South Carolina |
| 29 | Clifford O Mungin | 51 | Head | Assistant Manager | Georgia |
| 30 | Katie E Mungin | 51 | Wife | — | South Carolina |
| 31 | William D Jordan | 38 | Son | Fireman | Florida |
| 32 | Katherine Jordan | 25 | Wife | — | South Carolina |
| 33 | Julian D Clark | 58 | Head | Farmer | South Carolina |
| 34 | Mary Wood Clark | 57 | Wife | — | South Carolina |
| 35 | Margaret Clark | 19 | Daughter | — | South Carolina |
| 36 | Lorena Clark | 17 | Daughter | Secretary | South Carolina |
| 37 | Julian Clark | 15 | Son | — | South Carolina |
| 38 | John Clark THIS PERSON | 29 | Son | Operator | South Carolina |
| 39 | Mildred Clark | 30 | Wife | — | South Carolina |
| 40 | Frank G Clark | 0 | Son | — | South Carolina |
Related Census Records
Pedigree Summary
John + 4 siblings
Gen 1 · 4 parents
~0.84
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)